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authorEduardo Habkost <ehabkost@redhat.com>2015-02-09 17:35:04 -0200
committerEduardo Habkost <ehabkost@redhat.com>2015-03-19 16:20:15 -0300
commit549fc54b8cfe16a475d8f6b8f838e53b45452b4a (patch)
tree766aa9b1ce3930dea083ba3aa33e3ce402e29dc8 /numa.c
parentfb43b73b9225ff2d19cf5350c68112aade7eec13 (diff)
downloadqemu-arm-549fc54b8cfe16a475d8f6b8f838e53b45452b4a.tar.gz
numa: Print warning if no node is assigned to a CPU
We need all possible CPUs (including hotplug ones) to be present in the SRAT when QEMU starts. QEMU already does that correctly today, the only problem is that when a CPU is omitted from the NUMA configuration, it is silently assigned to node 0. Check if all CPUs up to max_cpus are present in the NUMA configuration and warn about missing CPUs. Make it just a warning, to allow management software to be updated if necessary. In the future we may make it a fatal error instead. Command-line examples: * Correct, no warning: $ qemu-system-x86_64 -smp 2,maxcpus=4 $ qemu-system-x86_64 -smp 2,maxcpus=4 -numa node,cpus=0-3 * Incomplete, with warnings: $ qemu-system-x86_64 -smp 2,maxcpus=4 -numa node,cpus=0 qemu-system-x86_64: warning: CPU(s) not present in any NUMA nodes: 1 2 3 qemu-system-x86_64: warning: All CPU(s) up to maxcpus should be described in NUMA config $ qemu-system-x86_64 -smp 2,maxcpus=4 -numa node,cpus=0-2 qemu-system-x86_64: warning: CPU(s) not present in any NUMA nodes: 3 qemu-system-x86_64: warning: All CPU(s) up to maxcpus should be described in NUMA config Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> --- v1 -> v2: (no changes) v2 -> v3: * Use enumerate_cpus() and error_report() for error message * Simplify logic using bitmap_full() v3 -> v4: * Clarify error message, mention that all CPUs up to maxcpus need to be described in NUMA config v4 -> v5: * Commit log update, to make problem description clearer
Diffstat (limited to 'numa.c')
-rw-r--r--numa.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/numa.c b/numa.c
index fe74e1eeaf..c975fb2682 100644
--- a/numa.c
+++ b/numa.c
@@ -200,6 +200,16 @@ static void validate_numa_cpus(void)
bitmap_or(seen_cpus, seen_cpus,
numa_info[i].node_cpu, MAX_CPUMASK_BITS);
}
+
+ if (!bitmap_full(seen_cpus, max_cpus)) {
+ char *msg;
+ bitmap_complement(seen_cpus, seen_cpus, max_cpus);
+ msg = enumerate_cpus(seen_cpus, max_cpus);
+ error_report("warning: CPU(s) not present in any NUMA nodes: %s", msg);
+ error_report("warning: All CPU(s) up to maxcpus should be described "
+ "in NUMA config");
+ g_free(msg);
+ }
}
void parse_numa_opts(MachineClass *mc)